Publications by authors named "Guan-Yong Wang"
Superconducting thin films have been a focal point for intensive research efforts since their reduced dimension allows for a wide variety of quantum phenomena. Many of these films, fabricated in UHV chambers, are highly vulnerable to air exposure, making it difficult to measure intrinsic superconducting properties such as zero resistance and perfect diamagnetism with ex situ experimental techniques. Previously, we developed a multifunctional scanning tunneling microscope (MSTM) containing in situ four-point probe (4PP) electrical transport measurement capability in addition to the usual STM capabilities [Ge et al.
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- Ultrathin bismuth films are identified as potential two-dimensional topological insulators, but their properties are influenced by factors such as film thickness and substrate interactions.
- Research utilizing advanced techniques like angle-resolved photoemission spectroscopy shows that Bi(111) films on a NbSe substrate exhibit quasi-freestanding band structures and one-dimensional edge states even at just three bilayers thick.
- The coexistence of these topological edge states and superconductivity, with pairing potential diminishing as layer thickness increases, positions the system as an exciting opportunity for investigating Majorana Fermions.
Article Synopsis
- Recent theories predict that Majorana zero modes (MZMs) can lead to spin selective Andreev reflection (SSAR), a unique magnetic property useful for detecting MZMs.
- Using spin-polarized scanning tunneling microscopy/spectroscopy, researchers examined SSAR in a Bi_{2}Te_{3}/NbSe_{2} topological superconductor.
- Findings show that the tunneling conductance is higher when the tip polarization aligns with the external magnetic field, providing evidence of MZMs and their magnetic properties, which could advance research in quantum computing.